Antique concentric millefiori glass paperweight doorknob

Here is another find from Sunday's antiques market - a really cool glass paperweight doorknob.
This item has a concentric millefiori design, in white, pink, & blue shades.
With a pegged base, the paperweight sits in a metal fitting that enables it to be attached to a door.
Looking at the fitting, it's evident that this is an old, original piece (these doorknobs have also been made in more recent times, circa 1980s by makers such as Strathearn & Perthshire).
The weight itself is in great condition with no damage or scratches.
Could possibly be of Bohemian manufacture, late 19th century.